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Kristian

2005-May-30 15:01 UTC

Proxy ARP working from Internet but not from fw and loc

Hello everybody.

I could not find an answer to my problem in the archive. (But that may just
be me :-) )

I have a problem with proxy arp and connection from loc (localnet) and from
the firewall.
Works fine from internet to dmz / proxy arp and vise versa.

I have a feeling the solution is simple, but I''m no guru in Linux
routing
etc.

The problem seems to be the routing setup.

loc - 10.0.0.0/24
net - 194.19.34.96/27
dmz - 10.0.10.0/24

There are different server on the DMZ via proxy arp and the all respond the
same.

One of the servers are 194.19.34.115.

If I ping this from "loc", tcpdump on the firewall gives response like
this:
13:50:25.613750 00:0f:3d:eb:d8:a9 > 00:0d:60:33:f9:da, ethertype IPv4
(0x0800), length 74: IP (tos 0x0, ttl 127, id 23932, offset 0, flags [none],
proto 1, length: 60) 10.0.0.50 > 194.19.34.115: icmp 40: echo request seq
13824
No reply

tcpdump on 115 shows:
13:45:16.266643 00:0f:3d:eb:d8:a9 > 00:0d:60:33:f9:da, ethertype IPv4
(0x0800), length 74: IP (tos 0x0, ttl 127, id 24603, offset 0, flags [none],
proto 1, length: 60) 10.0.0.50 > 194.19.34.115: icmp 40: echo request seq
14080


from fw to 115 gives:
13:52:46.143013 00:0f:3d:eb:d8:a9 > 00:0d:60:33:f9:da, ethertype IPv4
(0x0800), length 98: IP (tos 0x0, ttl  64, id 5, offset 0, flags [DF], proto
1, length: 84) 10.0.10.1 > 194.19.34.115: icmp 64: echo request seq 5
No reply
>From the internet it works fine:13:49:51.961554 00:0d:60:33:f9:da > 00:0f:3d:eb:d8:a9, ethertype IPv4
(0x0800), length 74: IP (tos 0x0, ttl  64, id 46328, offset 0, flags [none],
proto 1, length: 60) 194.19.34.115 > 217.8.138.87: icmp 40: echo reply seq 0
13:49:52.961112 00:0f:3d:eb:d8:a9 > 00:0d:60:33:f9:da, ethertype IPv4
(0x0800), length 74: IP (tos 0x0, ttl 120, id 12656, offset 0, flags [none],
proto 1, length: 60) 217.8.138.87 > 194.19.34.115: icmp 40: echo request seq
0

I can also ping between server on the dmz (with internet IP), but this of
course doesn''t go through the fw/shorewall.

Any ideas?

It doesn''t seem to be a blocking problem.
I have put all rules /policy''s to ACCEPT to try that.

Some configuration:

shorewall version
2.2.4

194.19.34.126 dev eth1  scope link
194.19.34.125 dev eth1  scope link
255.255.255.255 dev eth2  scope link
194.19.34.105 dev eth1  scope link
194.19.34.100 dev eth1  scope link
194.19.34.98 dev eth1  scope link
194.19.34.115 dev eth1  scope link
194.19.34.99 dev eth1  scope link
194.19.34.96/27 dev eth0  proto kernel  scope link  src 194.19.34.110
10.0.0.0/24 dev eth2  proto kernel  scope link  src 10.0.0.1
10.0.10.0/24 dev eth1  proto kernel  scope link  src 10.0.10.1
169.254.0.0/16 dev eth2  scope link
default via 194.19.34.97 dev eth0

1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
5: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc htb qlen 1000
    link/ether 00:0f:3d:eb:d8:aa brd ff:ff:ff:ff:ff:ff
    inet 194.19.34.110/27 brd 194.19.34.127 scope global eth0
    inet6 fe80::20f:3dff:feeb:d8aa/64 scope link
       valid_lft forever preferred_lft forever
6: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:0f:3d:eb:d8:a9 brd ff:ff:ff:ff:ff:ff
    inet 10.0.10.1/24 brd 10.0.10.255 scope global eth1
    inet6 fe80::20f:3dff:feeb:d8a9/64 scope link
       valid_lft forever preferred_lft forever
7: eth2: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:11:25:aa:78:ea brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.1/24 brd 10.0.0.255 scope global eth2
    inet6 fe80::211:25ff:feaa:78ea/64 scope link
       valid_lft forever preferred_lft forever
8: sit0: <NOARP> mtu 1480 qdisc noop
    link/sit 0.0.0.0 brd 0.0.0.0


/etc/shorewall/proxyarp
############################################################################
##
#ADDRESS        INTERFACE       EXTERNAL        HAVEROUTE       PERSISTENT
194.19.34.115   eth1            eth0            NO


/etc/shorewall/interface
############################################################################
##
#ZONE    INTERFACE      BROADCAST       OPTIONS
#
net      eth0           detect          norfc1918
loc      eth2           detect          dhcp
dmz      eth1           detect


Kind regards,
Kristian.

Alexander Wilms

2005-May-30 18:42 UTC

head link

Re: Proxy ARP working from Internet but not from fw and loc

On Monday 30 May 2005 17:01, Kristian wrote:
Hi Kristian,

just a quick guess: Do you have the correct route on your servers back to the 
10.0.0.0/24 network?

I don''t have the time now to read your post carefully. Please check
your
routing and maybe post your servers routing table. If it doesn''t help I
will
take a closer look.

Alex
> Hello everybody.
>
> I could not find an answer to my problem in the archive. (But that may just
> be me :-) )
>
> I have a problem with proxy arp and connection from loc (localnet) and from
> the firewall.
> Works fine from internet to dmz / proxy arp and vise versa.
>
> I have a feeling the solution is simple, but I''m no guru in Linux
routing
> etc.
>
> The problem seems to be the routing setup.
>
> loc - 10.0.0.0/24
> net - 194.19.34.96/27
> dmz - 10.0.10.0/24
>
> There are different server on the DMZ via proxy arp and the all respond the
> same.
>
> One of the servers are 194.19.34.115.
>
> If I ping this from "loc", tcpdump on the firewall gives response
like
> this: 13:50:25.613750 00:0f:3d:eb:d8:a9 > 00:0d:60:33:f9:da, ethertype
IPv4
> (0x0800), length 74: IP (tos 0x0, ttl 127, id 23932, offset 0, flags
> [none], proto 1, length: 60) 10.0.0.50 > 194.19.34.115: icmp 40: echo
> request seq 13824
> No reply
>
> tcpdump on 115 shows:
> 13:45:16.266643 00:0f:3d:eb:d8:a9 > 00:0d:60:33:f9:da, ethertype IPv4
> (0x0800), length 74: IP (tos 0x0, ttl 127, id 24603, offset 0, flags
> [none], proto 1, length: 60) 10.0.0.50 > 194.19.34.115: icmp 40: echo
> request seq 14080
>
>
> from fw to 115 gives:
> 13:52:46.143013 00:0f:3d:eb:d8:a9 > 00:0d:60:33:f9:da, ethertype IPv4
> (0x0800), length 98: IP (tos 0x0, ttl  64, id 5, offset 0, flags [DF],
> proto 1, length: 84) 10.0.10.1 > 194.19.34.115: icmp 64: echo request
seq 5
> No reply
>
> >From the internet it works fine:
>
> 13:49:51.961554 00:0d:60:33:f9:da > 00:0f:3d:eb:d8:a9, ethertype IPv4
> (0x0800), length 74: IP (tos 0x0, ttl  64, id 46328, offset 0, flags
> [none], proto 1, length: 60) 194.19.34.115 > 217.8.138.87: icmp 40: echo
> reply seq 0 13:49:52.961112 00:0f:3d:eb:d8:a9 > 00:0d:60:33:f9:da,
> ethertype IPv4 (0x0800), length 74: IP (tos 0x0, ttl 120, id 12656, offset
> 0, flags [none], proto 1, length: 60) 217.8.138.87 > 194.19.34.115: icmp
> 40: echo request seq 0
>
> I can also ping between server on the dmz (with internet IP), but this of
> course doesn''t go through the fw/shorewall.
>
> Any ideas?
>
> It doesn''t seem to be a blocking problem.
> I have put all rules /policy''s to ACCEPT to try that.
>
> Some configuration:
>
> shorewall version
> 2.2.4
>
> 194.19.34.126 dev eth1  scope link
> 194.19.34.125 dev eth1  scope link
> 255.255.255.255 dev eth2  scope link
> 194.19.34.105 dev eth1  scope link
> 194.19.34.100 dev eth1  scope link
> 194.19.34.98 dev eth1  scope link
> 194.19.34.115 dev eth1  scope link
> 194.19.34.99 dev eth1  scope link
> 194.19.34.96/27 dev eth0  proto kernel  scope link  src 194.19.34.110
> 10.0.0.0/24 dev eth2  proto kernel  scope link  src 10.0.0.1
> 10.0.10.0/24 dev eth1  proto kernel  scope link  src 10.0.10.1
> 169.254.0.0/16 dev eth2  scope link
> default via 194.19.34.97 dev eth0
>
> 1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
>     inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
>     inet6 ::1/128 scope host
>        valid_lft forever preferred_lft forever
> 5: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc htb qlen 1000
>     link/ether 00:0f:3d:eb:d8:aa brd ff:ff:ff:ff:ff:ff
>     inet 194.19.34.110/27 brd 194.19.34.127 scope global eth0
>     inet6 fe80::20f:3dff:feeb:d8aa/64 scope link
>        valid_lft forever preferred_lft forever
> 6: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
>     link/ether 00:0f:3d:eb:d8:a9 brd ff:ff:ff:ff:ff:ff
>     inet 10.0.10.1/24 brd 10.0.10.255 scope global eth1
>     inet6 fe80::20f:3dff:feeb:d8a9/64 scope link
>        valid_lft forever preferred_lft forever
> 7: eth2: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
>     link/ether 00:11:25:aa:78:ea brd ff:ff:ff:ff:ff:ff
>     inet 10.0.0.1/24 brd 10.0.0.255 scope global eth2
>     inet6 fe80::211:25ff:feaa:78ea/64 scope link
>        valid_lft forever preferred_lft forever
> 8: sit0: <NOARP> mtu 1480 qdisc noop
>     link/sit 0.0.0.0 brd 0.0.0.0
>
>
> /etc/shorewall/proxyarp
> ###########################################################################
># ##
> #ADDRESS        INTERFACE       EXTERNAL        HAVEROUTE       PERSISTENT
> 194.19.34.115   eth1            eth0            NO
>
>
> /etc/shorewall/interface
> ###########################################################################
># ##
> #ZONE    INTERFACE      BROADCAST       OPTIONS
> #
> net      eth0           detect          norfc1918
> loc      eth2           detect          dhcp
> dmz      eth1           detect
>
>
> Kind regards,
> Kristian.
>
>
>
>
>
>
> _______________________________________________
> Shorewall-users mailing list
> Post: Shorewall-users@lists.shorewall.net
> Subscribe/Unsubscribe:
> https://lists.shorewall.net/mailman/listinfo/shorewall-users Support:
> http://www.shorewall.net/support.htm
> FAQ: http://www.shorewall.net/FAQ.htm

Jerry Vonau

2005-May-30 20:45 UTC

head link

Re: Proxy ARP working from Internet but not from fw and loc

> Hello everybody.
>
> I could not find an answer to my problem in the archive. (But that
may just> be me :-) )
>
> I have a problem with proxy arp and connection from loc (localnet)
and from> the firewall.
> Works fine from internet to dmz / proxy arp and vise versa.
>
> I have a feeling the solution is simple, but I''m no guru in Linux
routing> etc.
>
> The problem seems to be the routing setup.
>
> loc - 10.0.0.0/24
> net - 194.19.34.96/27
> dmz - 10.0.10.0/24
>
> There are different server on the DMZ via proxy arp and the all
respond the> same.
>
> One of the servers are 194.19.34.115.
>
> If I ping this from "loc", tcpdump on the firewall gives response
like this:> 13:50:25.613750 00:0f:3d:eb:d8:a9 > 00:0d:60:33:f9:da, ethertype
IPv4> (0x0800), length 74: IP (tos 0x0, ttl 127, id 23932, offset 0, flags
[none],> proto 1, length: 60) 10.0.0.50 > 194.19.34.115: icmp 40: echo
request seq> 13824
> No reply
>
> tcpdump on 115 shows:
> 13:45:16.266643 00:0f:3d:eb:d8:a9 > 00:0d:60:33:f9:da, ethertype
IPv4> (0x0800), length 74: IP (tos 0x0, ttl 127, id 24603, offset 0, flags
[none],> proto 1, length: 60) 10.0.0.50 > 194.19.34.115: icmp 40: echo
request seq> 14080
>
>
> from fw to 115 gives:
> 13:52:46.143013 00:0f:3d:eb:d8:a9 > 00:0d:60:33:f9:da, ethertype
IPv4> (0x0800), length 98: IP (tos 0x0, ttl  64, id 5, offset 0, flags
[DF], proto> 1, length: 84) 10.0.10.1 > 194.19.34.115: icmp 64: echo request seq
5> No reply
>
> >From the internet it works fine:
> 13:49:51.961554 00:0d:60:33:f9:da > 00:0f:3d:eb:d8:a9, ethertype
IPv4> (0x0800), length 74: IP (tos 0x0, ttl  64, id 46328, offset 0, flags
[none],> proto 1, length: 60) 194.19.34.115 > 217.8.138.87: icmp 40: echo
reply seq 0> 13:49:52.961112 00:0f:3d:eb:d8:a9 > 00:0d:60:33:f9:da, ethertype
IPv4> (0x0800), length 74: IP (tos 0x0, ttl 120, id 12656, offset 0, flags
[none],> proto 1, length: 60) 217.8.138.87 > 194.19.34.115: icmp 40: echo
request seq> 0
>
> I can also ping between server on the dmz (with internet IP), but
this of> course doesn''t go through the fw/shorewall.
>
> Any ideas?
>
> It doesn''t seem to be a blocking problem.
> I have put all rules /policy''s to ACCEPT to try that.
>
> Some configuration:
>
> shorewall version
> 2.2.4
>
> 194.19.34.126 dev eth1  scope link
> 194.19.34.125 dev eth1  scope link
> 255.255.255.255 dev eth2  scope link
> 194.19.34.105 dev eth1  scope link
> 194.19.34.100 dev eth1  scope link
> 194.19.34.98 dev eth1  scope link
> 194.19.34.115 dev eth1  scope link
> 194.19.34.99 dev eth1  scope link
> 194.19.34.96/27 dev eth0  proto kernel  scope link  src
194.19.34.110> 10.0.0.0/24 dev eth2  proto kernel  scope link  src 10.0.0.1
> 10.0.10.0/24 dev eth1  proto kernel  scope link  src 10.0.10.1
> 169.254.0.0/16 dev eth2  scope link
> default via 194.19.34.97 dev eth0
>
> 1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
>     inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
>     inet6 ::1/128 scope host
>        valid_lft forever preferred_lft forever
> 5: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc htb qlen 1000
>     link/ether 00:0f:3d:eb:d8:aa brd ff:ff:ff:ff:ff:ff
>     inet 194.19.34.110/27 brd 194.19.34.127 scope global eth0
>     inet6 fe80::20f:3dff:feeb:d8aa/64 scope link
>        valid_lft forever preferred_lft forever
> 6: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen
1000>     link/ether 00:0f:3d:eb:d8:a9 brd ff:ff:ff:ff:ff:ff
>     inet 10.0.10.1/24 brd 10.0.10.255 scope global eth1
>     inet6 fe80::20f:3dff:feeb:d8a9/64 scope link
>        valid_lft forever preferred_lft forever
> 7: eth2: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen
1000>     link/ether 00:11:25:aa:78:ea brd ff:ff:ff:ff:ff:ff
>     inet 10.0.0.1/24 brd 10.0.0.255 scope global eth2
>     inet6 fe80::211:25ff:feaa:78ea/64 scope link
>        valid_lft forever preferred_lft forever
> 8: sit0: <NOARP> mtu 1480 qdisc noop
>     link/sit 0.0.0.0 brd 0.0.0.0
>
>
> /etc/shorewall/proxyarp
>######################################################################
######> ##
> #ADDRESS        INTERFACE       EXTERNAL        HAVEROUTE
PERSISTENT> 194.19.34.115   eth1            eth0            NO
>
>
> /etc/shorewall/interface
>######################################################################
######> ##
> #ZONE    INTERFACE      BROADCAST       OPTIONS
> #
> net      eth0           detect          norfc1918
> loc      eth2           detect          dhcp
> dmz      eth1           detect
>
>
> Kind regards,
> Kristian.
>
Ok here is what I think is happening. Traffic bound for the dmz from
loc need''s to be masq''d.
dmz uses public ip, but interface has private ip. no route to public
dmz. Change the dmz interface''s
ip to be the same as the net one as found here:

http://www.shorewall.net/ProxyARP.htm

Might have to add to the masq file:
eth1    eth2

Jerry Vonau

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